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GetMonthName.java
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GetMonthName.java
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package com.javamultiplex.datetime;
import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.Scanner;
/**
*
* @author Rohit Agarwal
* @category Date and Time
* @problem How to get month name of given date?
*
*/
public class GetMonthName {
public static void main(String[] args) {
Scanner input = null;
try {
input = new Scanner(System.in);
System.out.println("Enter date in dd/MM/yyyy format :");
String date = input.next();
// If Date is valid, converting String to Date
Date mydate = getValidDate(date);
if (mydate != null) {
// Creating Calendar class instance.
Calendar calendar = Calendar.getInstance();
// Converting Date to Calendar.
calendar.setTime(mydate);
// 0 -> January, 11- December
int month = calendar.get(Calendar.MONTH);
String monthName = getMonthName(month);
System.out.println("Month : " + monthName);
} else {
System.out.println("Date is invalid.");
}
} finally {
if (input != null) {
input.close();
}
}
}
private static Date getValidDate(String date) {
Date mydate = null;
if (isValidDateFormat(date)) {
/*
* d -> Day of month
* M -> Month of year
* y -> Year
*/
DateFormat dateFormat = new SimpleDateFormat("dd/MM/yyyy");
/*
* By default setLenient() is true. We should make it false for
* strict date validations.
*
* If setLenient() is true - It accepts all dates. If setLenient()
* is false - It accepts only valid dates.
*/
dateFormat.setLenient(false);
try {
mydate = dateFormat.parse(date);
} catch (ParseException e) {
mydate = null;
}
}
return mydate;
}
private static String getMonthName(int month) {
String monthName = null;
switch (month) {
case 0:
monthName = "January";
break;
case 1:
monthName = "February";
break;
case 2:
monthName = "March";
break;
case 3:
monthName = "April";
break;
case 4:
monthName = "May";
break;
case 5:
monthName = "June";
break;
case 6:
monthName = "July";
break;
case 7:
monthName = "August";
break;
case 8:
monthName = "September";
break;
case 9:
monthName = "October";
break;
case 10:
monthName = "November";
break;
case 11:
monthName = "December";
break;
}
return monthName;
}
private static boolean isValidDateFormat(String date) {
/*
* Regular Expression that matches String with format dd/MM/yyyy.
* dd -> 01-31
* MM -> 01-12
* yyyy -> 4 digit number
*/
String pattern = "(0?[1-9]|[12][0-9]|3[01])\\/(0?[1-9]|1[0-2])\\/([0-9]{4})";
boolean result = false;
if (date.matches(pattern)) {
result = true;
}
return result;
}
}